National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
A study was conducted to characterize and evaluate the extant varieties and parental lines of upland cotton using qualitative morphological traits for DUS testing of cotton. These data were subjected to various genetic principles. The results indicated that out of 26 traits, only 17 traits were included for Principal Component analysis (PCA) because of expression of variability. Traits like stem hairiness, flower petal colour and density of seed fuzz expressed much variation (four states) compared to other traits. Nine traits viz., hypocotyl pigmentation, leaf gossypol glands, leaf nectaries, leaf petiole pigmentation, stem pigmentation, male sterility, boll bearing habit, boll prominence of tip and boll opening showed no variability. The PCA revealed that the first seven PCs having eigen values >1 and contributed for 76.67% of the total variation. The variance explained by PC1 was mostly due to traits related to colour such as boll colour, petal colour, petal spot, anther filament colour, pollen colour, boll surface and leaf shape, whereas PC II mostly related to stem hairiness, leaf hairiness, leaf shape and bract type. Two-dimensional scatter plot was drawn supported with grouping patterns of cluster analysis. The cluster analysis classified 101 extant varieties into five divergent groups. The cluster II comprising of largest (57) genotypes followed by cluster I (36). The Shannon–Weaver diversity index (H’) was used for estimating the frequency distribution of diversity index. The traits viz., hypocotyl pigmentation, leaf gossypol glands, leaf nectarines, leaf petiole pigmentation, stem pigmentation, flower male sterility, boll bearing habit, boll prominence of tip and boll opening were higher (4.62) when compared to other traits.
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